<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<link rel="stylesheet" href="mycss.css">

<style>

    p{
        background-color: green;
    }

</style>
<body>
    <h1>外部文件样式表</h1>
    <p>外部样式表</p>
    <a href="http://www.baidu.com" style="color:gold">内联样式</a>
</body>
</html>